| /* |
| * Copyright (c) 1998, 2009, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package com.sun.crypto.provider; |
| |
| import java.nio.ByteBuffer; |
| |
| import javax.crypto.MacSpi; |
| import javax.crypto.SecretKey; |
| import java.security.*; |
| import java.security.spec.*; |
| |
| /** |
| * This is an implementation of the HMAC-SHA1 algorithm. |
| * |
| * @author Jan Luehe |
| */ |
| public final class HmacSHA1 extends MacSpi implements Cloneable { |
| |
| private HmacCore hmac = null; |
| private static final int SHA1_BLOCK_LENGTH = 64; |
| |
| /** |
| * Standard constructor, creates a new HmacSHA1 instance. |
| */ |
| public HmacSHA1() throws NoSuchAlgorithmException { |
| this.hmac = new HmacCore(MessageDigest.getInstance("SHA1"), |
| SHA1_BLOCK_LENGTH); |
| } |
| |
| /** |
| * Returns the length of the HMAC in bytes. |
| * |
| * @return the HMAC length in bytes. |
| */ |
| protected int engineGetMacLength() { |
| return hmac.getDigestLength(); |
| } |
| |
| /** |
| * Initializes the HMAC with the given secret key and algorithm parameters. |
| * |
| * @param key the secret key. |
| * @param params the algorithm parameters. |
| * |
| * @exception InvalidKeyException if the given key is inappropriate for |
| * initializing this MAC. |
| * @exception InvalidAlgorithmParameterException if the given algorithm |
| * parameters are inappropriate for this MAC. |
| */ |
| protected void engineInit(Key key, AlgorithmParameterSpec params) |
| throws InvalidKeyException, InvalidAlgorithmParameterException { |
| hmac.init(key, params); |
| } |
| |
| /** |
| * Processes the given byte. |
| * |
| * @param input the input byte to be processed. |
| */ |
| protected void engineUpdate(byte input) { |
| hmac.update(input); |
| } |
| |
| /** |
| * Processes the first <code>len</code> bytes in <code>input</code>, |
| * starting at <code>offset</code>. |
| * |
| * @param input the input buffer. |
| * @param offset the offset in <code>input</code> where the input starts. |
| * @param len the number of bytes to process. |
| */ |
| protected void engineUpdate(byte input[], int offset, int len) { |
| hmac.update(input, offset, len); |
| } |
| |
| protected void engineUpdate(ByteBuffer input) { |
| hmac.update(input); |
| } |
| |
| /** |
| * Completes the HMAC computation and resets the HMAC for further use, |
| * maintaining the secret key that the HMAC was initialized with. |
| * |
| * @return the HMAC result. |
| */ |
| protected byte[] engineDoFinal() { |
| return hmac.doFinal(); |
| } |
| |
| /** |
| * Resets the HMAC for further use, maintaining the secret key that the |
| * HMAC was initialized with. |
| */ |
| protected void engineReset() { |
| hmac.reset(); |
| } |
| |
| /* |
| * Clones this object. |
| */ |
| public Object clone() { |
| HmacSHA1 that = null; |
| try { |
| that = (HmacSHA1)super.clone(); |
| that.hmac = (HmacCore)this.hmac.clone(); |
| } catch (CloneNotSupportedException e) { |
| } |
| return that; |
| } |
| } |